text: /* $OpenBSD: auth2-none.c,v 1.20 2017/05/30 14:29:59 markus Exp $ */
  /*
   * Copyright (c) 2000 Markus Friedl.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "includes.h"
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/uio.h>
  
  #include <fcntl.h>
  #include <string.h>
  #include <unistd.h>
  #include <stdarg.h>
  #include <stdio.h>
  
  #include "atomicio.h"
  #include "xmalloc.h"
  #include "sshkey.h"
  #include "hostfile.h"
  #include "auth.h"
  #include "packet.h"
  #include "log.h"
  #include "buffer.h"
  #include "misc.h"
  #include "servconf.h"
  #include "compat.h"
  #include "ssh2.h"
  #include "ssherr.h"
  #ifdef GSSAPI
  #include "ssh-gss.h"
  #endif
  #include "monitor_wrap.h"
  
  /* import */
  extern ServerOptions options;
  
  /* "none" is allowed only one time */
  static int none_enabled = 1;
  
  static int
  userauth_none(struct ssh *ssh)
  {
  	int r;
  
  	none_enabled = 0;
  	if ((r = sshpkt_get_end(ssh)) != 0)
  		fatal("%s: %s", __func__, ssh_err(r));
  	if (options.permit_empty_passwd && options.password_authentication)
  		return (PRIVSEP(auth_password(ssh->authctxt, "")));
  	return (0);
  }
  
  Authmethod method_none = {
  	"none",
  	userauth_none,
  	&none_enabled
  };
  